Study on on-line detection scheme of DC electric energy metering for electric vehicles

Aiming at the periodic verification difficult problems of electric vehicle energy meter, put forward a kind of real — time on — line detection scheme of energy metering accuracy un6497der working conditions of electric vehicles, and developed successfully portable on-line detection device of DC energy meter for vehicles. Achieved high-precision current sampling by using zero-flux current sensing technology, reduced the device detection error jump through the average pulse method to improve the detection accuracy of the device. Selected electric vehicle operating conditions to road test, the actual program measurement accuracy can reach 0.2s level, can be applied to on-line detection of vehicle DC measuring instruments below level 1, with a certain value to promote.